package com.lx.gulimall.product.service.impl;


import org.springframework.stereotype.Service;

import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.lx.common.utils.PageUtils;
import com.lx.common.utils.Query;

import com.lx.gulimall.product.dao.CategoryDao;
import com.lx.gulimall.product.entity.CategoryEntity;
import com.lx.gulimall.product.service.CategoryService;


@Service("categoryService")
public class CategoryServiceImpl extends ServiceImpl<CategoryDao, CategoryEntity> implements CategoryService {

    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        IPage<CategoryEntity> page = this.page(
                new Query<CategoryEntity>().getPage(params),
                new QueryWrapper<CategoryEntity>()
        );

        return new PageUtils(page);
    }

    @Override
    public List<CategoryEntity> queryWithTree() {
        //1 查出所有数据
        List<CategoryEntity> entities = baseMapper.selectList(null);
        //2. 组装数据为树型
        //2.1.找出一级分类
        List<CategoryEntity> levelOne = entities.stream().
                filter(entity -> entity.getParentCid() == 0).
                map(menu->{
                    menu.setChildren(getChindren(menu,entities));
                    return menu;
                }).sorted((menu1,menu2)->{
            return (menu1.getSort()==null?0:menu1.getSort())-(menu2.getSort()==null?0:menu2.getSort());
        }).collect(Collectors.toList());

        return levelOne;
    }


    //logic delete records
    @Override
    public void removeMenusByIds(List<Long> asList) {
        //TODO 1. can remove records?

        //2. logic delete records
        baseMapper.deleteBatchIds(asList);

    }

    private List<CategoryEntity> getChindren(CategoryEntity root, List<CategoryEntity> all){
        List<CategoryEntity> children = all.stream().filter(o ->
                o.getParentCid() == root.getCatId())
                .map(o->{
                    o.setChildren(getChindren(o,all));
                    return o;
                }).sorted((menu1,menu2)->{
                    return (menu1.getSort()==null?0:menu1.getSort())-(menu2.getSort()==null?0:menu2.getSort());
                }).collect(Collectors.toList());
        return children;
    }

}